Throw AbstractClassInstantiationError if an abstract class is instantiated

runtime/lib/error.dart

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 // Errors are created and thrown by DartVM only.
 // Changes here should also be reflected in corelib/error.dart as well
 
 class AssertionErrorImplementation implements AssertionError {
   factory AssertionErrorImplementation._uninstantiable() {
     throw const UnsupportedOperationException(
         "AssertionError can only be allocated by the VM");
@@ skipping 89 matching lines @@
   String toString() => "Unresolved static method: url '$url' line $line "
       "pos $column\n$failedResolutionLine\n";
 
   static _throwNew(int token_pos) native "StaticResolutionException_throwNew";
 
   final String failedResolutionLine;
   final String url;
   final int line;
   final int column;
 }
+
+
+class AbstractClassInstantiationErrorImplementation
+    implements AbstractClassInstantiationError {
+
+  factory AbstractClassInstantiationErrorImplementation._uninstantiable() {
+    throw const UnsupportedOperationException(
+        "AbstractClassInstantiationError can only be allocated by the VM");
+  }
+
+  static _throwNew(int case_clause_pos, String className)
+      native "AbstractClassInstantiationError_throwNew";
+
+  String toString() {
+    return "Cannot instantiate abstract class $className: "
+           "url '$url' line $line";
+  }
+
+  final String className;
+  final String url;
+  final int line;
+}